Clio pyramidata Linnaeus 1767

Abstract

Clio pyramidata Linnaeus, 1767 (Figs 5 S-T) Description. – Pyramidally shaped shell (L to 20 mm, W to 10 mm) with greatest width above the middle of the shell. Two lateral ribs that are thickened and only slightly diverging. Distinct transverse striation and growth lines. Cross-section triangular except in the most posterior part. Longitudinal rib over the ventral side. Embryonic shell droplet-shaped with small cusp. Remarks. – This characteristic shell is easily identified, but generally the shells are broken. The larval shells or apical parts can be recognised based on their triangular outline with quickly widening shell. In apertural view the larval shell is initially mostly round, but gradually becomes boat shaped with round ventral (lower) side, two quickly expanding, marked carinas that are open on the inside, and a convex dorsal (upper) side (Raven & Alonso, 2023: figs 13b, 14b, 15a-b). Distribution. – A single specimen was found at Batu Mat coral bank and several in outer shelf sand (DD29) to continental slope planktonic ooze (DD15) off Sarawak, several more at Royal Charlotte atoll, small numbers in middle to outer shelf of Brunei (MES15-29) and outer shelf sand in Sabah (DD92-93).

Authors 4

1. Han
2. J. G. M.
3. Raven Aachen

   Naturalis Biodiversity Center

   Affiliation as printed

   Research Associate, Naturalis Biodiversity Center, Leiden, The Netherlands. E-mail: han. raven @ naturalis. nl; https: // orcid. org / 0000 - 0002 - 5305 - 0795

4. David J. Marshall

   Universiti Brunei Darussalam

   Affiliation as printed

   Environmental and Life Sciences, Faculty of Science, Universiti Brunei Darussalam, Brunei Darussalam. https: // orcid. org / 0000 - 0003 - 3771 - 5950 * Corresponding author. E-mail: david. marshall @ ubd. edu. bn